The material on which this biography is founded consists mainly, of course, of the papers collected at Hawarden. Besides that vast accumulation, I have been favoured with several thousands of other pieces from the legion of Mr. Gladstone's correspondents. Between two and three hundred thousand written papers of one sort or another must have passed under my view. To some important journals and papers from other sources I have enjoyed free access, and my warm thanks are due to those who have generously lent me this valuable aid.